Summary of Changes in Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Goodwill [Line Items]
Balance at beginning of year	$ 103,456
Balance at end of year	108,128
Lincoln Laser Company
Goodwill [Line Items]
Net working capital adjustment of Lincoln Laser acquisition	(43)
Reach Technology Inc.
Goodwill [Line Items]
Goodwill acquired from Reach acquisition	$ 4,715